So I think I lost some gains from bodybuilding Vol. Blames it on roommate.

Okay so the beginning of Spring semester and my roommate has been tagging along with me to the gym. I prefer to work alone but i dont want to be mean so i just let him lift with me. From what i know, this kid is trying to compete with me. Couple weeks in and this kid is able to press more while i improved little although i still shit on him on back and leg days. So i checked myself out in the mirror this morning and i realized that my muscles got smaller. Im startin to suspect this kid has been putting something in my protein drink (which is sitting right in my desk in the dorm room) that somehow made me lose muscle mass. Mind that im rarely in the the dorm while this nigga never goes out. Im paranoid that hes been fuckin with me just to get ahead. Is this possible HB or am i just overly paranoid???

Probably just working at a slower/sloppier rate by having a gym partner like him, especially a new boy who might not understand the mind set/intensity you want to work at. I prefer going alone, I get way more done. Doubt the dude is fucking your shakes up lol and even if he was what could he actually put in them to counter all the good shit the shake already has in it?